Piston-alignment-testing device



June a, 1924. 1,496,270

J. P; JONES PISTON ALIGNMENT TESTING DEVICE Filed April 20 1921 PatentedJune 3, 19124.

JUDSONP. Jones. on sen Josn, oamsonnre.

IIS'l'ONwfiLIGNlEENT-EESTING DEVICE.

Application filed April 20, 192 Serial no! 482,395.

T 0 all whom it may concern:

Be'it known that I, Jonson P. Jones, a citizen of theUnited States,residing at San Jose, in the county of Santa. Clara and State ofCalifornia, have invented new and useful Improvements inPiston-Alignment-Testing Devices, of which the following isaspecification. p

This invention relates to improvements in devices for testing thealignment of pistons, particularly of internal combustion engines andits primary object is to provide a simple and inexpensive implement ofthis character which is constructed sothat it may be quickly and easilyused in connection with pistons of various sizes and kinds to accuratelytest and determine the alignment thereof, the implement comprising rightangular portions one of which is adapted to extend alongside of andengage a piston, while th other is rested upon a bar or mandrel to whichthe connecting rod of the piston is attached during the testingoperation, said last named portion being of such construction that itwill readily accommodate itself to and engage evenly upon bars andmandrels of various sizes.

Another object is to provide a device of the character described whichis small, compact, may be stored in small compass and is constructed sothat it may be quickly and easily put into accurate use.

The invention possesses other advantages and features some of which,with the foregoing will be set forth at length in the followingdescription where I shall outline in full that form of the inventionwhich I have selected for illustration in the drawings accompanying andforming a part of the present specification. In said drawings I haveshown one form of the construction of my invention, but it is to beunderstood that I do not limit myself to such form since the inventionas expressed in the claim may be embodied in a plurality of forms.

Referring to the drawings:

Figure 1 is a side elevation of the device of this invention showing asit will appear when in use and also illustrating a piston as it wouldappear when out of alignment.

Figure 2 is an end elevation of the device showing it resting upon a baror mandrel.

Figure 3 is a top plan view of the device.

Referring to the embodiment of the in .vention which I have selected forillustration in the accompanying drawings, it will be seen that theinstrument or device is similar in appearance to a carpenters square andis L-shaped.

The device comprises a body portion 1,

preferablyin form of a casting and of an inverted Jrshape. Attached toone end of thebody 'portionand extendingat right angles't-hereto isa bar2 which is adapted in use'to extend along the side of the piston. Thebody 1 is provided upon its upper side with a suitable spirit level 3.Opposite sides of the body are cut away or notched as at 4 so as tofacilitate handling the device and to eliminate weight and material fromthe body. One end of the body is reduced, extended forwardly as at 5 andrecessed as at 6 so as to receive the lower enlarged end 7 of the bar 2.Suitable fastening elements 8 are inserted through portion 5 and end 7to secure the bar to the body. The lower end of the bar engages with theinner or lower wall 9 of the recess and this wall extends at rightangles to the forward edge of th bar. The upper edge of the body isprovided longitudinally with a rounded rib 10 and the spirit level. 3 ismounted upon this rib. The lower edge of the portion 5 terminates abovethe highest point of the under face of the body so as to avoid contactwith the bar or mandrel upon which the body is placed. The bar 2 ispreferably in the form of a flat rectangular strip, such as a rule, andis secured so as to present an edge for engagement with the side of thepiston. The sides of the bar may be provided with graduations orcalibrations 11 for general measurement 7 purposes.

In use the piston 12 and connecting rod 13 are mounted upon acylindrical bar or mandrel 14, the connecting rod 13 being clamped uponmandrel 14:. The mandrel is preferably mounted in a vise, not shown, andheld in horizontal position with the connecting rod and piston extendingsubstantially at rightangles thereto. The device of this invention isthen placed with the body portion 1 resting upon the mandrel, as shownin Figures 1 and 2. and by use of the spirit level 3 the mandrel may beadjusted so that it is brought into true horizontal position with thebar 2 extending along the side of and engaging the piston on one sidethereof, the piston is in proper alinement. It Will thus be seen that byreason of the'inverted V-shaped body 1, the

device may be quickly placed in. position upon a mandrel to test thealinement of the piston. By reason of the V-shaped body the properfitting of the said body upon the mandrel, regardless of the sizethereof, may be readily effected and the body will lie parallel to themandrel at all times partly embracing the mandrel whereby the body isfirmly and evenly seated.

I claim:

A device for testing alignment of a piston and a connecting rod securedthereto, said device comprising means for supporting said connecting rodand extending at right angles to said rod, an L-shaped instrumentcomprising an inverted \l-shaped body portion adapted to extend alongand engage the connecting rod supporting means, said inverted V-shapedbody having notches in opposite sides thereof and provided at one endwith a portion to which the other part of the Lshaped instrument isattached, said other part of the L-shaped instrument being graduated andadapted to extend along the side of and engage the piston.

IUDSON P. JONES.

